
import re

html = ''' <li class="">	<a href="//pvp.qq.com/web201605/herodetail/128.shtml" target="_blank" onclick="PTTSendClick('header','freeHero-1','周免英雄');">		<img class="small" data-id="128" src="//game.gtimg.cn/images/yxzj/img201606/heroimg/128/128.jpg" width="69" height="69">		<img class="large" data-id="128" src="//game.gtimg.cn/images/yxzj/img201606/heroimg/128/128-freehover.png" width="224" height="69">	</a></li>'''


# pattern = 'src=".+?"'
pattern = 'src=".*?"'
regext = re.compile(pattern)
res = regext.findall(html)
print(res)